Recently my xorg.conf configuration stopped working, though I haven't made any changes to it.
My card is nvidia 6800, I've been using AIGLX+Compiz Fusion with TwinView configuration on Fedora 7 without any problems.

In my new, working configuration, the driver is 'nv' not 'nvidia' and manual changes back to 'nvidia' causes X server to crash.

After entering "nVidia dispay settings" i get the "You do not appear to be using the NVIDIA X driver. Please edit your X configuration file (just run `nvidia-xconfig` as root), and restart the X server" message. When I do what I'm asked for, the X servers crashes after X's reload.

I want to use NVIDIA driver but I cannot, the working driver is 'nv' only.
At now, using compiz-fusion is not an issue as I can't even make 'nvidia' driver working. I use up-to-date kmod-nvidia driver from livna repository.